From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e28smtp07.in.ibm.com ([122.248.162.7]:47618 "EHLO e28smtp07.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755060AbaFKLdC (ORCPT ); Wed, 11 Jun 2014 07:33:02 -0400 Received: from /spool/local by e28smtp07.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 11 Jun 2014 17:03:00 +0530 Received: from d28relay01.in.ibm.com (d28relay01.in.ibm.com [9.184.220.58]) by d28dlp03.in.ibm.com (Postfix) with ESMTP id BD0941258053 for ; Wed, 11 Jun 2014 17:02:20 +0530 (IST) Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id s5BBXp9l59244600 for ; Wed, 11 Jun 2014 17:03:51 +0530 Received: from d28av01.in.ibm.com (localhost [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id s5BBWuKF015546 for ; Wed, 11 Jun 2014 17:02:57 +0530 From: Chandan Rajendra To: clm@fb.com, jbacik@fb.com, bo.li.liu@oracle.com, dsterba@suse.cz Cc: Chandan Rajendra , linux-btrfs@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com Subject: [RFC PATCH V2 3/8] Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size. Date: Wed, 11 Jun 2014 17:02:16 +0530 Message-Id: <1402486341-592-4-git-send-email-chandan@linux.vnet.ibm.com> In-Reply-To: <1402486341-592-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1402486341-592-1-git-send-email-chandan@linux.vnet.ibm.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: Currently, the code reserves/releases extents in multiples of PAGE_CACHE_SIZE units. Fix this. Signed-off-by: Chandan Rajendra --- fs/btrfs/file.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 006af2f..541e227 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1339,18 +1339,21 @@ fail: static noinline int lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages, size_t num_pages, loff_t pos, + size_t write_bytes, u64 *lockstart, u64 *lockend, struct extent_state **cached_state) { + struct btrfs_root *root = BTRFS_I(inode)->root; u64 start_pos; u64 last_pos; int i; int ret = 0; - start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); - last_pos = start_pos + ((u64)num_pages << PAGE_CACHE_SHIFT) - 1; + start_pos = pos & ~((u64)root->sectorsize - 1); + last_pos = start_pos + + ALIGN(pos + write_bytes - start_pos, root->sectorsize) - 1; - if (start_pos < inode->i_size) { + if (start_pos < inode->i_size) { struct btrfs_ordered_extent *ordered; lock_extent_bits(&BTRFS_I(inode)->io_tree, start_pos, last_pos, 0, cached_state); @@ -1468,6 +1471,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, while (iov_iter_count(i) > 0) { size_t offset = pos & (PAGE_CACHE_SIZE - 1); + size_t sector_offset; size_t write_bytes = min(iov_iter_count(i), nrptrs * (size_t)PAGE_CACHE_SIZE - offset); @@ -1488,7 +1492,9 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, break; } - reserve_bytes = num_pages << PAGE_CACHE_SHIFT; + sector_offset = pos & (root->sectorsize - 1); + reserve_bytes = ALIGN(write_bytes + sector_offset, root->sectorsize); + ret = btrfs_check_data_free_space(inode, reserve_bytes); if (ret == -ENOSPC && (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | @@ -1503,7 +1509,9 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, num_pages = (write_bytes + offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - reserve_bytes = num_pages << PAGE_CACHE_SHIFT; + + reserve_bytes = ALIGN(write_bytes + sector_offset, + root->sectorsize); ret = 0; } else { ret = -ENOSPC; @@ -1536,8 +1544,8 @@ again: break; ret = lock_and_cleanup_extent_if_need(inode, pages, num_pages, - pos, &lockstart, &lockend, - &cached_state); + pos, write_bytes, &lockstart, &lockend, + &cached_state); if (ret < 0) { if (ret == -EAGAIN) goto again; @@ -1574,9 +1582,9 @@ again: * we still have an outstanding extent for the chunk we actually * managed to copy. */ - if (num_pages > dirty_pages) { - release_bytes = (num_pages - dirty_pages) << - PAGE_CACHE_SHIFT; + if (write_bytes > copied) { + release_bytes = (write_bytes - copied) + & ~((u64)root->sectorsize - 1); if (copied > 0) { spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents++; @@ -1590,7 +1598,7 @@ again: release_bytes); } - release_bytes = dirty_pages << PAGE_CACHE_SHIFT; + release_bytes = ALIGN(copied + sector_offset, root->sectorsize); if (copied > 0) ret = btrfs_dirty_pages(root, inode, pages, @@ -1609,7 +1617,7 @@ again: if (only_release_metadata && copied > 0) { u64 lockstart = round_down(pos, root->sectorsize); u64 lockend = lockstart + - (dirty_pages << PAGE_CACHE_SHIFT) - 1; + ALIGN(copied, root->sectorsize) - 1; set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, EXTENT_NORESERVE, NULL, -- 1.8.3.1